I had a diffcult time ( )my homework yesterday . A.do B.to dou C.doing. D.die解释理由

问题描述:

I had a diffcult time ( )my homework yesterday . A.do B.to dou C.doing. D.die
解释理由

C

B

C.doing 固定搭配had a diffcult[hard] time (in )doing sth/sth[作某事有困难或不容易]